There was a feeling of apprehension at the end of this chapter. What elements helped create this mood?

Scout can't put on her costume or take it off without someone else's help because it pins her arms down, and she can't see well through the eyeholes. Jem escorts her to the pageant, because Atticus is too tired to go, and Aunt Alexandra opts to stay home with him. There is a general sense of weariness and even melancholy because of the stress of the trial.